The gym never closes; CSA has an open-air gym, so it's not possible to close it. At some point, they turn out the lights. I was the first person to arrive at the gym every morning of our CSA trip in 2008, and I turned on all of the lights and fans before starting my workout.

There is a desk across from the spa entrance where they have towels available. Just grab one as you head for the gym.

They provide towels at the sports desk as soon as you walk in the building, make sure you remember your room number as they record that info. I dont think there is a set time for opening, I'm usually in there between 7 & 8 am. ,sometimes I gotta turn on the lights & fans myself, sometimes there's already other people there, the staff shows up a little after 8 am.

I've stayed at all four of the Couples Resorts in the last 2.5 years, and I don't recall any gym at any particular resort having posted hours for its gym. I work out around 5:30 or 6 am and was able to access the gym at all four resorts before 7 am. None of them were locked or closed.